A man's nipples has sensitive nerves located there, which means, when you touch his nipples, lick it, bite it or suck on them, he would feel pleasure.
The Joys of Gay Nipple Play: 7 Top Tips
Criticism - e-flux
Play With His Nipples, He Will Love It And Beg For More - Gaylaxy
Book of the Dead: Patricia Cornwell: 9780751534054: Books
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Jacob Was Supposed To Be A Bisexual Romance Option Too? Who Else
The Game Plan (Game On, #3) by Kristen Callihan
Muscle Growth Focused on ExpansionWriters - DeviantArt
Dean Blunt and NoName Give Us (Some) Hope - The New York Times